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Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume 45,
Number 1, January 2007, pp.16-21
Analysis of Polymer Additives in High-Temperature
Liquid Chromatography
Byoung-Hyoun Kim, D.-K. Yang, and Jong Hoa Ok
Analytical Science, Corporate R&D / LG Chemical Research Park,
LG Chemical Ltd., 104-1, Moonji-dong, Yusong-gu, Daejeon, 305-380,
South Korea
A high-temperature liquid chromatographic technique
is employed for the separation of commercially available polymer
additives to enhance the resolution and speed. Separation efficiencies
and elution behaviors for seven phthalate plasticizers and five
antioxidants are evaluated at elevated column temperatures and
with a thermal gradient. Diamondbond C18 (octadecylsilica), Zirchrom
PS (zirconia-based polystyrene), and Zirchrom PBD (zirconia-based
polybutadiene) columns are selected for the study because of their
thermal stability. The temperature programming is controlled with
a column oven in conjunction with an independent mobile phase
preheater and a post-column effluent cooling assembly. Van’t
Hoff plots show that the reverse-phase liquid chromatography mechanism
is maintained over a wide range of column temperatures. A 1% increase
of acetonitrile in the mobile phase is estimated to have a comparable
effect as a 7–7.5°C column temperature increase on the
retention time changes.
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